Re: [CAD_CAM_EDM_DRO] Re: EMC (I want...)
Posted by
Jon Elson
on 2000-11-09 22:27:57 UTC
Smoke wrote:
however, if the pitch change is not too big.
But, they are more likely to be used in rotary screw compressors,
pumps for high viscosity liquids, etc. Two variable-pitch screws
that are mirror images of each other will turn together like helical
gears. It seems that one of the rotors always has 'fat' teeth and
the other one has 'thin'. That may have to do with making the
trapped pockets of air move through the compressor's inlet
and exhaust ports better, or something.
Rotary screw compressors make some of the best air compressors
on a number of characteristics. But, they are VERY hard to make
on manual machines.
I really don't think you'd make these with thread programs, however.
The rotors have VERY complex geometry in 3 axes, and you'd need
a fancy program to design the shape and guarantee that the trapped
air pockets will be sealed in all the way through the compressor, without
a gap developing at some point in the rotation that lets the air leak
backwards. You'd also need careful control, as the gap between the
2 rotors and the housing is just a couple of thousandths of an inch.
I thought about making one of these, mostly as a 'can I do it' type
of project.
Jon
> Whoa! variable "pitch" threads? How do you get those to screw into aThey don't, generally. A variable pitch thread might work in wood,
> mating part?
however, if the pitch change is not too big.
But, they are more likely to be used in rotary screw compressors,
pumps for high viscosity liquids, etc. Two variable-pitch screws
that are mirror images of each other will turn together like helical
gears. It seems that one of the rotors always has 'fat' teeth and
the other one has 'thin'. That may have to do with making the
trapped pockets of air move through the compressor's inlet
and exhaust ports better, or something.
Rotary screw compressors make some of the best air compressors
on a number of characteristics. But, they are VERY hard to make
on manual machines.
I really don't think you'd make these with thread programs, however.
The rotors have VERY complex geometry in 3 axes, and you'd need
a fancy program to design the shape and guarantee that the trapped
air pockets will be sealed in all the way through the compressor, without
a gap developing at some point in the rotation that lets the air leak
backwards. You'd also need careful control, as the gap between the
2 rotors and the housing is just a couple of thousandths of an inch.
I thought about making one of these, mostly as a 'can I do it' type
of project.
Jon
Discussion Thread
Wally K
2000-11-07 19:26:27 UTC
EMC and lead screw compensation
Ray
2000-11-08 07:04:18 UTC
Re: EMC and lead screw compensation
Smoke
2000-11-08 08:15:42 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC and lead screw compensation
Wally K
2000-11-08 08:55:32 UTC
Re: EMC and lead screw compensation
Smoke
2000-11-08 09:19:03 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC and lead screw compensation
Wally K
2000-11-08 09:31:19 UTC
Re: EMC and lead screw compensation
Jon Elson
2000-11-08 12:22:22 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC and lead screw compensation
Paul Corner
2000-11-08 14:03:34 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC and lead screw compensation
Smoke
2000-11-08 14:16:28 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC and lead screw compensation
r_fl_z@h...
2000-11-08 14:34:23 UTC
Re: EMC and lead screw compensation
Bill
2000-11-08 14:50:58 UTC
Re: EMC and lead screw compensation
Jon Elson
2000-11-08 15:38:26 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC and lead screw compensation
Jon Elson
2000-11-08 15:49:18 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC and lead screw compensation
ballendo@y...
2000-11-08 17:02:02 UTC
Re: EMC and lead screw compensation
Ray
2000-11-08 17:58:11 UTC
Re: Re: EMC and lead screw compensation
ballendo@y...
2000-11-08 20:41:52 UTC
Re: Re: EMC and lead screw compensation
Jon Elson
2000-11-08 22:11:07 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC and lead screw compensation
dave engvall
2000-11-09 09:36:58 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC and lead screw compensation
Paul Corner
2000-11-09 15:47:48 UTC
EMC (I want...)
Wally K
2000-11-09 16:21:25 UTC
Re: EMC (I want...)
Smoke
2000-11-09 16:30:11 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC (I want...)
Jerry Kimberlin
2000-11-09 17:33:25 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC (I want...)
Fred Smith
2000-11-09 19:47:12 UTC
Re: EMC (I want...)
Smoke
2000-11-09 21:58:55 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC (I want...)
Jon Elson
2000-11-09 22:27:57 UTC
Re: [CAD_CAM_EDM_DRO] Re: EMC (I want...)
jmw@c...
2000-11-09 23:28:18 UTC
Re: EMC (I want...)